Application of Modified Hoek–Brown Strength Criterion in Water-Rich Soft Rock Tunnel

Table 6

Displacement of surrounding rock under different strength criterion.

Section number	Section	The deformation value of tunnel vault (mm)	The displacement using generalized Hoek-Brown strength criterion		Displacement using modified Hoek-Brown strength criterion
			Theoretical value (mm)	Relative error (%)	Theoretical value (mm)	Relative error (%)
1		53.6 mm	44.33 mm	-20.91%	54.53 mm	1.71%
2		55.1 mm	44.33 mm	-24.30%	54.53 mm	-1.05%
3		44.3 mm	43.51 mm	-1.81%	43.51 mm	-1.81%
4		42.3 mm	43.51 mm	2.78%	43.51 mm	2.78%